'Air stripping' is used in water treatment to remove:
Choose the correct answer
Suspended solids and turbidity
Volatile organics (VOCs), dissolved gases (CO2, H2S), ammonia — compounds with high Henry''s constant transfer to air
Total dissolved solids (TDS)
Colour and taste only
Correct Answer
B. Volatile organics (VOCs), dissolved gases (CO2, H2S), ammonia — compounds with high Henry''s constant transfer to air
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Air stripping (packed tower or spray): volatile organic compounds (VOCs), dissolved gases (CO2, H2S, radon), ammonia at high pH. Henry''s law: volatilisation rate depends on Henry''s constant and gas-liquid contact. Used for: groundwater remediation (BTEX, TCE, chlorinated solvents), removing CO2 to raise pH before softening, removing H2S (odour). NOT effective for non-volatile compounds.
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